freetype: CVE-2007-3506: memory buffer overwrite bug

Debian Bug report logs - #432013
freetype: CVE-2007-3506: memory buffer overwrite bug

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: "Alec Berryman" <alec@thened.net>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: freetype: CVE-2007-3506: memory buffer overwrite bug

Date: Fri, 06 Jul 2007 11:49:47 -0500

Package: freetype
Severity: grave
Tags: security

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Hash: SHA1

CVE-2007-3506 [0]:

The ft_bitmap_assure_buffer function in src/base/ftbimap.c in FreeType
2.3.3 allows context-dependent attackers to cause a denial of service
and possibly execute arbitrary code via unspecified vectors involving
bitmap fonts, related to a "memory buffer overwrite bug."

This vulnerability may allow access to the accounts of users who use the
package.  The original bug report [1] provides instructions on how to
reproduce the issue, but I have been unable to do so.  The CVE links to
a patch from freetype's CVS [2]; the code appears to have changed
between Debian's 2.2 and upstream's 2.3 enough that I can't locate where
in ftbitmap.c the offending code exists (if at all).

If this does turn out to affect Debian's version, please note the CVE in
the changelog.

Thanks,

Alec

[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3506
[1] http://savannah.nongnu.org/bugs/index.php?19536
[2] http://cvs.savannah.nongnu.org/viewvc/freetype2/src/base/ftbitmap.c?root=freetype&r1=1.17&r2=1.18&diff_format=u

- -- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.18-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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Message #10 received at 432013-done@bugs.debian.org (full text, mbox, reply):

From: Steve Langasek <vorlon@debian.org>

To: Alec Berryman <alec@thened.net>, 432013-done@bugs.debian.org

Subject: Re: Bug#432013: freetype: CVE-2007-3506: memory buffer overwrite bug

Date: Sat, 7 Jul 2007 15:59:16 -0700

Hi Alec,

On Fri, Jul 06, 2007 at 11:49:47AM -0500, Alec Berryman wrote:
> The ft_bitmap_assure_buffer function in src/base/ftbimap.c in FreeType
> 2.3.3 allows context-dependent attackers to cause a denial of service
> and possibly execute arbitrary code via unspecified vectors involving
> bitmap fonts, related to a "memory buffer overwrite bug."

> This vulnerability may allow access to the accounts of users who use the
> package.  The original bug report [1] provides instructions on how to
> reproduce the issue, but I have been unable to do so.  The CVE links to
> a patch from freetype's CVS [2]; the code appears to have changed
> between Debian's 2.2 and upstream's 2.3 enough that I can't locate where
> in ftbitmap.c the offending code exists (if at all).

Thank you for the report.  I have reviewed the code in question, and am
confident that the vulnerability does not exist in Freetype 2.2.1, having
been introduced in a later reorganization of the ftbitmap.c code.  I'm
therefore closing this report, as no action is necessary for the Debian
packages.

Cheers,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
vorlon@debian.org                                   http://www.debian.org/

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